Redplum has a few great coupons for pet food! Print this $3/1 Pedigree Dog Food coupon to get the 3.5lb. bags for only $1! They're price cut to $4 through 4/2, but the coupon has a low print limit, so print your's now! (Don't forget to print two. :])
Also, you can grab the cans of The Goodlife Recipe for Cats for free (plus overage!) using this $1.50/1 The Goodlife Recipe Cat Food coupon. They're only $0.77, so the coupon should allow for some overage on the rest of your purchase.